Originally Posted by Scrodzilla

If you don't have a star nut install tool, you can just tap it down, either before or after making your cut depending on how much your removing. I used to do it with a wooden dowel that fit nicely inside the steerer or a long bolt with the same threading as the top cap bolt - just thread it into the starnut and lightly tap it with a hammer. Be careful not to tap it down too much and you'll be all set.